JP3173182B2 - Grader selection device in brown rice sorter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brown rice sorter for removing only low-quality grains from brown rice after drying and hulling to extract only high-quality grains, and which one of a plurality of types of graders having different sorts is selected. The present invention relates to a grader selecting device for selecting whether to use a gradient.

[0002]

2. Description of the Related Art It is empirically known that there is a certain correspondence between the grain size and the taste of rice, that is, the property that rice grains having a larger grain size have a better taste. Utilizing this property, in a conventional grain drying and preparation facility, brown rice after drying and hulling is supplied to a grain size sorter (so-called grader), and only grain having a grain size of a certain value or more is taken out, thereby obtaining brown rice. It is widely practiced to remove low-quality grains, scrap rice, and broken rice from the whole to obtain good-quality good-quality grains.

[0003]

However, the correspondence between the particle size and the taste is not always uniform, and differs depending on the rice variety and cultivation conditions. For example, as shown in FIG.
In this case, the target taste value S can be obtained by setting the selection target to 1.85 mm. However, in order to obtain the same taste value S for other varieties B, the selection target needs to be 1.95 mm. in this way,
To select a variety of rice to ensure a certain level of taste,
The criteria for discriminating between good-quality and low-quality grains, i.e., the grade of grader selection, must be appropriately changed according to the properties of the rice.

[0004] However, the determination of the selection purpose has conventionally been largely based on the empirical rules of the selection operator based on the variety and appearance of the rice, so that it is difficult to appropriately set the selection purpose, and with many years of experience. It required skill.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a grader selection apparatus which can objectively determine the selection condition which has conventionally required skill and can always set an accurate selection condition.

[0006]

In order to achieve the above object,
The grader selection device in the brown rice sorter of the present invention is configured as follows.

[0007] In a brown rice sorter that switches the flow path of brown rice by a switching device and supplies the brown rice to one of a plurality of types of graders having different sorting purposes, and sorts the brown rice into particles having a particle size equal to or larger than a predetermined particle size. Sample collecting means for collecting sample grains from the brown rice, sample particle size selecting means for sorting the sample grains collected by the sample collecting means to a predetermined particle size or more, and sample particle size selecting means for sorting. And a sample internal quality detecting means for detecting an internal quality value of each sample grain of each class. In addition, the said internal quality value means the content value of taste-related components, such as a taste value and protein.

[0008]

When the sample collecting means collects sample grains from the hulled rice after hulling, the sample grains are classified into at least two grades according to the size of the particle size by the sample grain sorting means.
The sample internal quality detecting means measures the internal quality value of each of the sample grains of each class. Next, a grader is selected based on the measurement results, and the brown rice after the hulling is selected using the grader.

As described above, according to the present invention, a part of brown rice to be sorted is collected as a sample grain, and based on the measurement of the internal quality of the sample grain, the grader of any sorting purpose is selected for the whole brown rice. Select whether or not. Therefore, while the conventional selection of the grader is based only on the size of the particle size, the present invention can also reflect the actual internal quality value in the selection of the grader, so that it is always accurate. This makes it possible to select a suitable target, and also eliminates the need for skilled workers.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is an explanatory view schematically showing a brown rice sorter embodying the present invention. Reference numeral 1 denotes a receiving hopper for receiving brown rice after drying and hulling, and reference numeral 2 denotes a grain-raising machine that rises brown rice supplied to the receiving hopper 1. A waste rice removal grader 3 for sorting and removing waste rice / crushed rice according to the size of the particle size is connected to the upper end discharge port of the grain raising machine 2. The size of the waste rice removal grader 3 is 1.80 mm.

On the discharge side of the graded rice removal grader 3, a weighing scale 4 and a scaled rice scale 5 are arranged, and the remaining side of the graded rice removal grader 3 is placed on the scaler 4 and the removed side is graded. Respectively connected to the measuring devices 5. Sizing scale 4
The hopper 7 of the grain raising machine 8 is connected to the discharge side of the
A temporary storage tank 9 is connected to the upper end discharge port.

The discharge side of the sizing device 4 and the hopper 7
A switching device 18 is provided between the two, and a sample inspection system 6 described later is connected to a branch of the switching device 18.

On the other hand, the outlet of the temporary storage tank 9 is connected to a distribution conveyor 10 via a switching device 19. Below the distribution conveyor 10, the graders 11A, 11B, 11C, which are grain size sorters for sorting brown rice other than sample grains, are provided.
And an appropriate switching device (not shown) is provided so that brown rice of the distribution conveyor 10 is selectively supplied to any one of the graders 11A, 11B, and 11C. The graders 11A, 11B, and 11C have different eyes, and for example, the grader 11A has 1.8.
5 mm, 1.90 mm for the main grader 11B, and 1.95 mm for the main grader 11C.

On the discharge side of each of the graders 11A, 11B, 11C, a high-quality grain conveyor 12 and a low-quality grain conveyor 1 are provided.
3 and the remaining side of each grader is a high-quality grain conveyor 12.
In addition, the removal side of each grader is connected to the low-quality grain conveyor 13. The end of the high-quality particle conveyor 12 is a high-quality particle measuring device 14.
And the discharge side of the good-grain measuring device 14 is connected to a grain-raising machine 17 and a switchable good-grain sample outlet 20 is provided here, and the discharging side is connected to the taste meter 16 and the component measuring device 21 I do. The end of the low-grain conveyor 13 is connected to a low-quality rice tank (not shown) via the low-grain scale 15. In addition, the switching device 1 for the outlet of the temporary storage tank 9 described above.
The other of the nine branches is connected to a good-quality grain conveyor 12.

Next, the sample test system 6 connected to one branch of the switching device 18 will be described. This sample inspection system 6 takes out a small amount of sample grains from the whole brown rice and inspects the same to determine the criteria for discriminating between high quality grains and low quality grains of brown rice other than the sample grains, that is, the three types of graders 11A to 11C. This is for deciding which of the objectives is to be used.

As shown in FIG. 1, the switching device 18
Hopper 25 and sample huller 26
, A sample grader 27 is provided for classifying the sample particles into four classes according to the particle size. This sample grader 27 uses, for example, a rotating inclined cylindrical sieve, and the fit is 1.85 mm at the start end 27A, 1.90 mm at the middle 27B, and 1.95 m at the end 27C.
m.

The start end portion 27A and the intermediate portion 27
B, a measuring instrument 28 below the end portion 27C and the outlet 27D.
A, 28B, 28C, and 28D are arranged, and a conveyor 29 is arranged on the discharge side of these measuring devices 28A to 28D. The end of the conveyor 29 is connected to the taste meter 33, and the discharge side of the taste meter 33 is connected to the hopper 30 of the grain lifting machine 31. Scales 28A, 28B, 28C, 2
The 8D and the taste meter 33 are electrically connected to the input side of the central processing unit 32 for controlling each unit as described later.
Note that the above-described measuring devices are provided on the input side of the central processing unit 32,
Each taste meter, etc., and each switching device 18, 19,
In addition to 20, a switching device of the distribution conveyor 10 and the like are electrically connected.

Next, the operation of the brown rice sorter of the first embodiment will be described. First, brown rice received by the receiving hopper 1 is raised by the grain raising machine 2 and separated by the waste rice removal grader 3. The separated waste rice is stored in the waste rice tank via the waste rice measuring device 5. On the other hand, the sized particles remaining in the waste rice removal grader 3 are weighed by a weighing device 4. Then, the switching device 18 is switched from the hopper 7 side to the sample inspection system 6 for a short time, and the sized particles after measurement are supplied to the sample inspection system 6 as sample particles.

In FIG. 1, the sized granules, ie, sample granules, supplied from the switching device 18 are supplied from a hopper 25 to a grain raising machine 2.
6 and supplies it to the sample grader 27. In the sample grader 27, as described above, the start ends 27A,
Since the mesh size is different between the intermediate portion 27B and the terminal portion 27C, the particle size of the supplied sample particles is 1.85.
If the particle size is less than 1.85 mm,
1.90 mm is transferred to the measuring instrument 28B and the particle size is 1.90.
の も の 1.95 mm into a weighing machine 28C with a particle size of 1.9
Those with a size of 5 mm or more flow out to the weighing devices 28D, are sorted out by four types of classes, and are weighed respectively.

Next, the sample grains of each class measured by the measuring devices 28A to 28D are sequentially supplied to the taste meter 33 by the conveyor 29 for each class, and the respective taste values are detected.
The taste value for each class detected by the taste meter 33 is input to the central processing unit 32.

In the central processing unit 32, based on the taste value of each rank detected by the taste meter 33, the grain size value serving as a criterion for distinguishing good and low quality grains from the received brown rice, that is, the graders of the graders 11A to 11C. Decide which to use. For example, a graph showing the relationship between each class of the particle size and the taste value is created (see FIG. 3), and based on this graph, a point where the taste value exceeds the target taste value S is obtained as a score. As a result, for example, the size of a certain type A is specified as 1.85 mm, and the size of another type B is specified as 1.95 mm.

On the other hand, in FIG. 2, brown rice supplied from the sizing device 4 to the hopper 7 via the switching device 18 is put into the temporary storage tank 9 by the grain raising machine 8. Here, as described above, when the designation of the target is performed by the central processing unit 32, the effect is output to the switching device (not shown) of the distribution conveyor 10, and the supply path of the brown rice is selected according to the specified target. Is selected. Then, the switching device 19 is operated to discharge brown rice from the temporary storage tank 9 and the brown rice is distributed to the distribution conveyor 10.
Is supplied to the grader specified by the central processing unit 32.

As a result, the brown rice is the designated book grader 1
The brown rice that has been sorted according to the target of 1A to 11C and that has remained on the grader passes through the high-quality grain conveyor 12 and the high-quality grain measuring device 14.
The brown rice removed from the graders 11A to 11C is separated and stored in the low-grain weighing device 15 via the low-grain conveyor 13. Thereafter, the high-quality particles measured by the high-quality particle measuring device 14 are carried out by the grain raising machine 17 to a next process, for example, a shipping process. In addition, the brown rice after the measurement is appropriately taken out to the high-quality grain taste meter 16 by the switching device 20, and the taste is inspected.

As described above, in the first embodiment, a part of brown rice to be sorted is collected as a sample grain, and based on the measurement of the taste of the sample grain, the sorting condition of the whole received brown rice is designated. And Therefore, in contrast to the conventional method in which the selection target is selected approximately only by the size of the particle size, in the first embodiment, the actual taste value can be reflected in the selection of the present grader. There is an advantage that a proper grader can always be selected, a skill of an operator is not required, and a constant taste can be always ensured and quality can be stabilized.

Next, a second embodiment will be described. The second embodiment is different from the sample inspection system 6 of the first embodiment described above.
Is a sample inspection system 41 as shown in FIG. The mechanical configuration of the second embodiment other than the sample inspection system 41 is the same as that of the first embodiment.

The sample inspection system 41 in the second embodiment has the following configuration. Switching device 18 (see FIG. 2)
The hopper 42 and the sample raising machine 43
And a switching device 44 is connected to the upper end discharge port of the sample grain raising machine 43. A reversible distribution conveyor 45 is connected to one of the outlets of the switching device 44, and one end of a good-quality reversible conveyor 46 is connected to the other of the switching device 44. Below the distribution conveyor 45, three sample graders 47A, 47B, 47C are arranged, and the distribution conveyor 45 supplies a grain to any one of these three sample graders ( (Not shown). Grader for sample 4
The target of 7A, 47B, 47C is, for example, 1.85 mm,
1.90 mm and 1.95 mm, respectively. These three sample graders 47A, 4
On the remaining side of 7B and 47C, the high-quality grain conveyor 46 described above is provided.
, And a low-quality grain conveyor 48 is connected to the removal side.

A taste meter 49 is connected to one end of the distribution conveyor 45. The end of the high-quality grain conveyor 46 is connected to the distribution conveyor 45 via the returning grain raising machine 50. Also,
A hopper 52 having a switching device 51 is further connected to the end of the high-quality grain conveyor 46. One discharging path of the switching device 51 is connected to a hopper 54 of a grain-lifting machine 53, and the other discharging path is connected to a taste meter 55. Connect to

The operation of the second embodiment will be described. Now, the sized granules, that is, the sample granules, supplied from the switching device 18 are raised by the sample grain raising machine 43 from the hopper 42 and transferred to the distribution conveyor 45 from the switching device 44.
Then, first, the sample grains are supplied to the taste meter 49, and the taste value of the entire sample grains is measured.

Next, based on the detected taste value of the whole sample grain, it is determined whether or not it is necessary to carry out the eye control described later. That is, when the taste value of the entire sample grain is a standard value, it is determined that it is not necessary to perform the eye control described later. In this case, a standard graded sample grader, for example, a sample grader 47B is used for selecting sample grains.

On the other hand, if the taste value of the whole sample grain is not a standard value, it is determined that it is necessary to perform the eye control described later. In this case, first, a good quality rice conveyor 4
The sample grains are supplied to the sample graders 47A, 47B, 47C in ascending order from the smaller one to the larger one using the 6 and the returning grain raising machine 50, whereby the sample grains are sorted by particle size. . The selected sample grains of each class are raised again by the returning grain-raising machine 50, respectively, and are applied to the taste meter 49. Based on the detected value of each class, as shown in FIG. Create a relational graph between eyes and tastes like

Then, based on the relationship graph between the texture and the taste, the texture control, that is, the control relating to the switching of the sample grader used for selecting the sample grains is performed. The eye control is the same as the control of the first embodiment described above. Based on the designation of the sample grader, the central processing unit outputs a control output to the switching device of the distribution conveyor 45, and the flow path of the sample particles is changed. The mode is switched to a predetermined sample grader, for example, the sample grader 47C, and the sample grains are sorted.

The taste of the high-quality rice selected by the sample grader is detected by a taste meter 55, and the detected value is compared with a predetermined reference value to determine whether or not the sample grader is properly selected. Is determined. The result of this determination is fed back to the selection of the sample grader,
Control is performed to switch the switching device of the distribution conveyor 45, such as when the taste value is smaller than the reference value, the weight is small, when the taste value is larger than the reference value, the weight is large, and so on.

On the other hand, in conjunction with the determination of the sample grader in the sample inspection system 41, a control signal is output from the central processing unit to the switching device of the distribution conveyor 10 (see FIG. 2). The book grader of the same order as the determined sample grader is selected as the book grader for the whole brown rice. Therefore, brown rice other than the sample grains is always supplied to the main grader having the same degree as the sample grader and sorted. The subsequent operation of the second embodiment is the same as that of the first embodiment.

As described above, in the second embodiment, the taste of the entire sample grain is measured in advance by the taste meter 49 in controlling the meshing of the sample grader based on the analysis of the sample grain. Since it is configured to determine whether or not it is necessary to perform the control, the eye control is executed only when the necessity is high, and there is no waste of control. Further, in the present embodiment, after sorting by the sample grader, the taste of the good-quality grains is measured by the taste meter 55 and the result is fed back to the switching of the sample grader. Can always be properly selected, so that the taste of the finished rice can be stabilized,
There is an advantage that the yield can be stabilized by preventing brown rice from being wasted.

Next, a third embodiment will be described.

Generally, it can be considered that the taste value and the price are almost proportional to each other. Therefore, in order to improve the price of high quality rice, it is sufficient to increase the grade of the grader and increase the taste value. However, as shown in the graph of FIG. 5, there is a relationship that increasing the taste value of brown rice in the same group lowers the yield. Many unpolished brown rice will be wasted, yields will be reduced, and overall profits will be reduced. For this reason, in order to improve profits, it is necessary to set an optimal selection target in consideration of not only the taste value but also the yield.

Therefore, the purpose of the third embodiment is to prevent waste of brown rice according to the properties and quality of brown rice by obtaining the most delicious and high quality granules while preventing the yield from being excessively lowered. . The mechanical configuration of the third embodiment is the same as that of the above-described first embodiment, and only the control is different as described below. Therefore, the operation thereof will be described with reference to FIGS.

In FIG. 2, brown rice received in the receiving hopper 1 is first supplied to the waste rice removal grader 3 to separate waste rice, and then supplied to the sample inspection system 6 via the switching device 18.

In FIG. 1, the supplied sized, that is, sample grains, are supplied to a sample grader 27, and are classified into four classes based on the particle size. The selected sample particles are weighed by measuring devices 28A to 28D, respectively.
The detected values of these weighing devices 28A to 28D are input to the central processing unit 32. On the other hand, the measured sample grains of each class are sequentially supplied to the taste meter 33 by the conveyor 29, and the taste value is detected. The detected taste value of each class is also input to the central processing unit 32.

In the central processing unit 32, first, based on the weight value for each particle size of each class, the yield when each grader (11A to 11C in FIG. 2) for receiving brown rice from which sample grains are taken out is used. Is calculated for each grader. Next, based on the calculated yield and the taste value of each class input from the taste meter 33, the profit is trially calculated for each of the graders 11A to 11C. Then, the main grader having the maximum profit is designated as the main grader used for selecting brown rice other than the sample grains, and is output to the switching device of the distribution conveyor 10. Therefore, the supply path of brown rice is selected according to this output, and the received brown rice is sorted by the grader designated by the central processing unit 32. The subsequent operation of the third embodiment is the same as that of the first embodiment.

As described above, in the third embodiment, the sample grains are sorted by particle size, the yield is estimated from the weight values of the selected classes, and each sample is calculated based on the calculated yield and the taste value of each class. The profit in the case of using the grader was estimated, and this grader was selected so that the profit could be maximized. As described above, in the third embodiment, in selecting this grader, as in the first embodiment, in addition to considering the taste value of the sample grains, the yield is further considered, so that only the taste value is considered. The adverse effects of reduced yield and reduced overall profit can be prevented beforehand,
There is an advantage that the maximum profit can always be obtained according to the quality.

Next, application examples of the present invention will be described.
In the above-described first embodiment, one of a plurality of book graders having different purposes is selected based on the taste value of each grade of the sample grain, and the selection is performed using the selected specific book grader. By doing so, good quality granules having a taste value equal to or higher than a certain value were obtained. However, the number of graders that can be installed is limited, and it is not possible to finely adjust the selection purpose, so this grader is selected so that the taste value of high-quality grains is slightly higher than the original target taste value. Do. Therefore, brown rice may be wasted between the target taste value and the taste value of good-quality grains. Therefore, the purpose of this application example is to mix an appropriate amount of low-quality grains whose taste value is lower than the target taste value with good-quality grains whose taste value is slightly higher than the target taste value, and change the taste value of the good-quality grains to the original target taste value. Therefore, the whole brown rice is efficiently used to prevent waste.

As shown in FIG. 6, a high-quality grain tank 62, 6 of each class is connected via a distribution conveyor 61 to an upper end discharge port of the grain raising machine 17 connected to the high-quality grain measuring device 14 (see FIG. 2).
3, 64 are connected. Then, this grader 11A-1
The brown rice, which has been classified by rank in 1C (see FIG. 2) and whose taste value has been measured, is sequentially conveyed, and the high quality grain tanks 62, 63, and 6 are conveyed.
4 accommodates each class. Then, good-quality grains are taken out from a tank (for example, tank 64) exceeding the reference taste value. Next, of the tanks 62 and 63 below the reference taste value,
Brown rice is taken out in order from the one having the larger particle size (tank 63), and is blended with the high-quality granules taken out from the tank 64 first. Here, in the case where the grain size of brown rice of each class and the weight ratio of brown rice of each class occupying the whole are, for example, the distribution as shown in FIG. 7 and FIG. In order to determine the amount of brown rice mixed in from the 63, the central processing unit performs the following calculation.

Now, assuming that the target taste value is 75, the average taste value of brown rice having a particle size of 1.80 mm or more is 7 from the table in FIG.
7.1, weight is 70% of the whole. Further, the particle size is 1.7.
The average taste value of brown rice of 5 mm or more is 74.1. From this, to obtain brown rice with a target taste value of 75, a particle size of 1.8 is required.
It can be seen that it is only necessary to mix a particle having a particle size of 1.75 to 1.80 mm with a particle having a diameter of 0 mm or more at a fixed ratio. This 1.75 ~
Assuming that the blending ratio of brown rice of 1.80 mm is {%}, 70 × 77.1 + χ × 60 = (70 + χ) × 75∴χ = 9.8 [%] That is, all brown rice having a particle size of 1.80 mm or more. In addition to,
Brown rice having a particle size of 1.75 to 1.80 mm is added to 9.9 of the total brown rice weight.
If only 8% is mixed, the overall taste value is 75 times the target taste value.
It turns out that it becomes.

Further, the weight ratio of 9.8% of the total brown rice weight to the brown rice having a particle size of 1.75 to 1.80 mm is represented by X
Assuming [%], X = (9.8 / 15) × 100 = 65.3 [%]. In other words, 65.3% of brown rice having a particle size of 1.75 to 1.8 mm may be blended with brown rice of 1.80 mm or more. The yield at this time is improved by 9.8% to 70 + 9.8 = 79.8 [%].

Based on the calculation results, the total amount of the tank containing brown rice having a particle size of 1.80 mm or more, and the particle size of 1.75.
9.8% of the storage capacity of the tank 63 for storing brown rice of about 1.80 mm is discharged by controlling a fixed amount discharge device (for example, a rotary valve) (not shown) of each tank.

As described above, in this application example, the whole brown rice is selected according to the particle size, the taste value and the weight value are detected, and based on both the detected values, the brown rice of which particle size is blended in which ratio. If the target taste value can be obtained, brown rice of each class is blended according to the calculation result to obtain brown rice according to the target taste value. Therefore, since the waste of brown rice between the target taste value and the taste value of good-quality grains can be eliminated, the brown rice can be used more efficiently by improving the yield. In addition, since the taste value of high-quality rice is equal to the target taste value, there is an advantage that the taste can be homogenized in the shipping stage.

In this application example, the taste value of brown rice of each class is detected, and the mixing ratio is determined based on the detected taste value. By detecting the content of each class of taste-related components (eg, protein), and mixing brown rice of each class such that the content of each taste-related component is in accordance with a predetermined reference value, the Taste management can be performed more accurately.

[0049]

As described above in detail, according to the present invention, a part of brown rice to be sorted is collected as a sample grain, and based on the measurement of the internal quality of the sample grain, which sort of brown rice is selected as a whole. Specifies whether to use the grader of the case. Therefore, while the conventional selection of the grader is based only on the size of the particle size, the present invention can also reflect the actual internal quality value in the selection of the grader, so that it is always accurate. This makes it possible to select a suitable target, and also eliminates the need for skilled workers.

[Brief description of the drawings]

FIG. 1 is a system diagram schematically showing a sample inspection system according to a first embodiment of the present invention.

FIG. 2 is a system diagram schematically showing a brown rice sorter of the first embodiment.

FIG. 3 is a diagram showing a relationship between a particle size and a taste value in a plurality of types of brown rice.

FIG. 4 is a system diagram schematically showing a sample inspection system according to a second embodiment of the present invention.

FIG. 5 is a diagram showing a relationship between a taste value and yield in specific brown rice.

FIG. 6 is a system diagram showing a high-quality grain tank according to an application example of the present invention.

FIG. 7 is a distribution diagram showing the weight ratio of specific brown rice by particle size.

FIG. 8 is a diagram showing weight ratios and taste values of specific brown rice for each particle size.

[Explanation of symbols]

 6 Sample Inspection System 11A, 11B, 11C Main Grader 16 Taste Meter 27 Sample Grader 28A, 28B, 28C, 28D Weight Detector 32 Central Processing Unit

Continued on the front page (72) Inventor, Sadaka Fujioka, Aji-cho, Ami-machi, Inashiki-gun, Ibaraki Pref. 4818 Iseki Agricultural Machinery Co., Ltd.Tsukuba Research Institute (72) Inventor, Toyoyuki Takanami 4818, Ami-cho, Ami-cho, Inashiki-gun, Ibaraki Pref. In-house (56) References JP-A-3-201941 (JP, A) JP-A-63-20080 (JP, A) JP-A-62-13585 (JP, U) JP-A-4-45576 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B07C 5/00-5/38 B07B 1/00 B07B 1/46

Claims (1)

(57) [Claims] 1. A flow path of brown rice is switched by a switching device,
The brown rice is supplied to any one of a plurality of types of graders having different selection goals, and in a brown rice sorter that sorts a predetermined particle size or more and below, sample collecting means for collecting sample grains from the brown rice, A sample particle size selecting unit that sorts the sample particles collected by the sample collecting unit into a predetermined particle size or more and below, and an internal quality value is detected for each class of sample particles selected by the sample particle size selecting unit. A grader selection device for a brown rice sorter comprising: